diff options
Diffstat (limited to 'drivers/md/raid5.c')
| -rw-r--r-- | drivers/md/raid5.c | 1493 |
1 files changed, 924 insertions, 569 deletions
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index 826eb346735..94829804ab7 100644 --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -47,7 +47,9 @@ #include <linux/kthread.h> #include <linux/raid/pq.h> #include <linux/async_tx.h> +#include <linux/async.h> #include <linux/seq_file.h> +#include <linux/cpu.h> #include "md.h" #include "raid5.h" #include "bitmap.h" @@ -499,11 +501,18 @@ async_copy_data(int frombio, struct bio *bio, struct page *page, struct page *bio_page; int i; int page_offset; + struct async_submit_ctl submit; + enum async_tx_flags flags = 0; if (bio->bi_sector >= sector) page_offset = (signed)(bio->bi_sector - sector) * 512; else page_offset = (signed)(sector - bio->bi_sector) * -512; + + if (frombio) + flags |= ASYNC_TX_FENCE; + init_async_submit(&submit, flags, tx, NULL, NULL, NULL); + bio_for_each_segment(bvl, bio, i) { int len = bio_iovec_idx(bio, i)->bv_len; int clen; @@ -525,15 +534,14 @@ async_copy_data(int frombio, struct bio *bio, struct page *page, bio_page = bio_iovec_idx(bio, i)->bv_page; if (frombio) tx = async_memcpy(page, bio_page, page_offset, - b_offset, clen, - ASYNC_TX_DEP_ACK, - tx, NULL, NULL); + b_offset, clen, &submit); else tx = async_memcpy(bio_page, page, b_offset, - page_offset, clen, - ASYNC_TX_DEP_ACK, - tx, NULL, NULL); + page_offset, clen, &submit); } + /* chain the operations */ + submit.depend_tx = tx; + if (clen < len) /* hit end of page */ break; page_offset += len; @@ -592,6 +600,7 @@ static void ops_run_biofill(struct stripe_head *sh) { struct dma_async_tx_descriptor *tx = NULL; raid5_conf_t *conf = sh->raid_conf; + struct async_submit_ctl submit; int i; pr_debug("%s: stripe %llu\n", __func__, @@ -615,22 +624,34 @@ static void ops_run_biofill(struct stripe_head *sh) } atomic_inc(&sh->count); - async_trigger_callback(ASYNC_TX_DEP_ACK | ASYNC_TX_ACK, tx, - ops_complete_biofill, sh); + init_async_submit(&submit, ASYNC_TX_ACK, tx, ops_complete_biofill, sh, NULL); + async_trigger_callback(&submit); } -static void ops_complete_compute5(void *stripe_head_ref) +static void mark_target_uptodate(struct stripe_head *sh, int target) { - struct stripe_head *sh = stripe_head_ref; - int target = sh->ops.target; - struct r5dev *tgt = &sh->dev[target]; + struct r5dev *tgt; - pr_debug("%s: stripe %llu\n", __func__, - (unsigned long long)sh->sector); + if (target < 0) + return; + tgt = &sh->dev[target]; set_bit(R5_UPTODATE, &tgt->flags); BUG_ON(!test_bit(R5_Wantcompute, &tgt->flags)); clear_bit(R5_Wantcompute, &tgt->flags); +} + +static void ops_complete_compute(void *stripe_head_ref) +{ + struct stripe_head *sh = stripe_head_ref; + + pr_debug("%s: stripe %llu\n", __func__, + (unsigned long long)sh->sector); + + /* mark the computed target(s) as uptodate */ + mark_target_uptodate(sh, sh->ops.target); + mark_target_uptodate(sh, sh->ops.target2); + clear_bit(STRIPE_COMPUTE_RUN, &sh->state); if (sh->check_state == check_state_compute_run) sh->check_state = check_state_compute_result; @@ -638,16 +659,24 @@ static void ops_complete_compute5(void *stripe_head_ref) release_stripe(sh); } -static struct dma_async_tx_descriptor *ops_run_compute5(struct stripe_head *sh) +/* return a pointer to the address conversion region of the scribble buffer */ +static addr_conv_t *to_addr_conv(struct stripe_head *sh, + struct raid5_percpu *percpu) +{ + return percpu->scribble + sizeof(struct page *) * (sh->disks + 2); +} + +static struct dma_async_tx_descriptor * +ops_run_compute5(struct stripe_head *sh, struct raid5_percpu *percpu) { - /* kernel stack size limits the total number of disks */ int disks = sh->disks; - struct page *xor_srcs[disks]; + struct page **xor_srcs = percpu->scribble; int target = sh->ops.target; struct r5dev *tgt = &sh->dev[target]; struct page *xor_dest = tgt->page; int count = 0; struct dma_async_tx_descriptor *tx; + struct async_submit_ctl submit; int i; pr_debug("%s: stripe %llu block: %d\n", @@ -660,17 +689,215 @@ static struct dma_async_tx_descriptor *ops_run_compute5(struct stripe_head *sh) atomic_inc(&sh->count); + init_async_submit(&submit, ASYNC_TX_FENCE|ASYNC_TX_XOR_ZERO_DST, NULL, + ops_complete_compute, sh, to_addr_conv(sh, percpu)); if (unlikely(count == 1)) - tx = async_memcpy(xor_dest, xor_srcs[0], 0, 0, STRIPE_SIZE, - 0, NULL, ops_complete_compute5, sh); + tx = async_memcpy(xor_dest, xor_srcs[0], 0, 0, STRIPE_SIZE, &submit); else - tx = async_xor(xor_dest, xor_srcs, 0, count, STRIPE_SIZE, - ASYNC_TX_XOR_ZERO_DST, NULL, - ops_complete_compute5, sh); + tx = async_xor(xor_dest, xor_srcs, 0, count, STRIPE_SIZE, &submit); return tx; } +/* set_syndrome_sources - populate source buffers for gen_syndrome + * @srcs - (struct page *) array of size sh->disks + * @sh - stripe_head to parse + * + * Populates srcs in proper layout order for the stripe and returns the + * 'count' of sources to be used in a call to async_gen_syndrome. The P + * destination buffer is recorded in srcs[count] and the Q destination + * is recorded in srcs[count+1]]. + */ +static int set_syndrome_sources(struct page **srcs, struct stripe_head *sh) +{ + int disks = sh->disks; + int syndrome_disks = sh->ddf_layout ? disks : (disks - 2); + int d0_idx = raid6_d0(sh); + int count; + int i; + + for (i = 0; i < disks; i++) + srcs[i] = (void *)raid6_empty_zero_page; + + count = 0; + i = d0_idx; + do { + int slot = raid6_idx_to_slot(i, sh, &count, syndrome_disks); + + srcs[slot] = sh->dev[i].page; + i = raid6_next_disk(i, disks); + } while (i != d0_idx); + BUG_ON(count != syndrome_disks); + + return count; +} + +static struct dma_async_tx_descriptor * +ops_run_compute6_1(struct stripe_head *sh, struct raid5_percpu *percpu) +{ + int disks = sh->disks; + struct page **blocks = percpu->scribble; + int target; + int qd_idx = sh->qd_idx; + struct dma_async_tx_descriptor *tx; + struct async_submit_ctl submit; + struct r5dev *tgt; + struct page *dest; + int i; + int count; + + if (sh->ops.target < 0) + target = sh->ops.target2; + else if (sh->ops.target2 < 0) + target = sh->ops.target; + else + /* we should only have one valid target */ + BUG(); + BUG_ON(target < 0); + pr_debug("%s: stripe %llu block: %d\n", + __func__, (unsigned long long)sh->sector, target); + + tgt = &sh->dev[target]; + BUG_ON(!test_bit(R5_Wantcompute, &tgt->flags)); + dest = tgt->page; + + atomic_inc(&sh->count); + + if (target == qd_idx) { + count = set_syndrome_sources(blocks, sh); + blocks[count] = NULL; /* regenerating p is not necessary */ + BUG_ON(blocks[count+1] != dest); /* q should already be set */ + init_async_submit(&submit, ASYNC_TX_FENCE, NULL, + ops_complete_compute, sh, + to_addr_conv(sh, percpu)); + tx = async_gen_syndrome(blocks, 0, count+2, STRIPE_SIZE, &submit); + } else { + /* Compute any data- or p-drive using XOR */ + count = 0; + for (i = disks; i-- ; ) { + if (i == target || i == qd_idx) + continue; + blocks[count++] = sh->dev[i].page; + } + + init_async_submit(&submit, ASYNC_TX_FENCE|ASYNC_TX_XOR_ZERO_DST, + NULL, ops_complete_compute, sh, + to_addr_conv(sh, percpu)); + tx = async_xor(dest, blocks, 0, count, STRIPE_SIZE, &submit); + } + + return tx; +} + +static struct dma_async_tx_descriptor * +ops_run_compute6_2(struct stripe_head *sh, struct raid5_percpu *percpu) +{ + int i, count, disks = sh->disks; + int syndrome_disks = sh->ddf_layout ? disks : disks-2; + int d0_idx = raid6_d0(sh); + int faila = -1, failb = -1; + int target = sh->ops.target; + int target2 = sh->ops.target2; + struct r5dev *tgt = &sh->dev[target]; + struct r5dev *tgt2 = &sh->dev[target2]; + struct dma_async_tx_descriptor *tx; + struct page **blocks = percpu->scribble; + struct async_submit_ctl submit; + + pr_debug("%s: stripe %llu block1: %d block2: %d\n", + __func__, (unsigned long long)sh->sector, target, target2); + BUG_ON(target < 0 || target2 < 0); + BUG_ON(!test_bit(R5_Wantcompute, &tgt->flags)); + BUG_ON(!test_bit(R5_Wantcompute, &tgt2->flags)); + + /* we need to open-code set_syndrome_sources to handle the + * slot number conversion for 'faila' and 'failb' + */ + for (i = 0; i < disks ; i++) + blocks[i] = (void *)raid6_empty_zero_page; + count = 0; + i = d0_idx; + do { + int slot = raid6_idx_to_slot(i, sh, &count, syndrome_disks); + + blocks[slot] = sh->dev[i].page; + + if (i == target) + faila = slot; + if (i == target2) + failb = slot; + i = raid6_next_disk(i, disks); + } while (i != d0_idx); + BUG_ON(count != syndrome_disks); + + BUG_ON(faila == failb); + if (failb < faila) + swap(faila, failb); + pr_debug("%s: stripe: %llu faila: %d failb: %d\n", + __func__, (unsigned long long)sh->sector, faila, failb); + + atomic_inc(&sh->count); + + if (failb == syndrome_disks+1) { + /* Q disk is one of the missing disks */ + if (faila == syndrome_disks) { + /* Missing P+Q, just recompute */ + init_async_submit(&submit, ASYNC_TX_FENCE, NULL, + ops_complete_compute, sh, + to_addr_conv(sh, percpu)); + return async_gen_syndrome(blocks, 0, count+2, + STRIPE_SIZE, &submit); + } else { + struct page *dest; + int data_target; + int qd_idx = sh->qd_idx; + + /* Missing D+Q: recompute D from P, then recompute Q */ + if (target == qd_idx) + data_target = target2; + else + data_target = target; + + count = 0; + for (i = disks; i-- ; ) { + if (i == data_target || i == qd_idx) + continue; + blocks[count++] = sh->dev[i].page; + } + dest = sh->dev[data_target].page; + init_async_submit(&submit, + ASYNC_TX_FENCE|ASYNC_TX_XOR_ZERO_DST, + NULL, NULL, NULL, + to_addr_conv(sh, percpu)); + tx = async_xor(dest, blocks, 0, count, STRIPE_SIZE, + &submit); + + count = set_syndrome_sources(blocks, sh); + init_async_submit(&submit, ASYNC_TX_FENCE, tx, + ops_complete_compute, sh, + to_addr_conv(sh, percpu)); + return async_gen_syndrome(blocks, 0, count+2, + STRIPE_SIZE, &submit); + } + } else { + init_async_submit(&submit, ASYNC_TX_FENCE, NULL, + ops_complete_compute, sh, + to_addr_conv(sh, percpu)); + if (failb == syndrome_disks) { + /* We're missing D+P. */ + return async_raid6_datap_recov(syndrome_disks+2, + STRIPE_SIZE, faila, + blocks, &submit); + } else { + /* We're missing D+D. */ + return async_raid6_2data_recov(syndrome_disks+2, + STRIPE_SIZE, faila, failb, + blocks, &submit); + } + } +} + + static void ops_complete_prexor(void *stripe_head_ref) { struct stripe_head *sh = stripe_head_ref; @@ -680,12 +907,13 @@ static void ops_complete_prexor(void *stripe_head_ref) } static struct dma_async_tx_descriptor * -ops_run_prexor(struct stripe_head *sh, struct dma_async_tx_descriptor *tx) +ops_run_prexor(struct stripe_head *sh, struct raid5_percpu *percpu, + struct dma_async_tx_descriptor *tx) { - /* kernel stack size limits the total number of disks */ int disks = sh->disks; - struct page *xor_srcs[disks]; + struct page **xor_srcs = percpu->scribble; int count = 0, pd_idx = sh->pd_idx, i; + struct async_submit_ctl submit; /* existing parity data subtracted */ struct page *xor_dest = xor_srcs[count++] = sh->dev[pd_idx].page; @@ -700,9 +928,9 @@ ops_run_prexor(struct stripe_head *sh, struct dma_async_tx_descriptor *tx) xor_srcs[count++] = dev->page; } - tx = async_xor(xor_dest, xor_srcs, 0, count, STRIPE_SIZE, - ASYNC_TX_DEP_ACK | ASYNC_TX_XOR_DROP_DST, tx, - ops_complete_prexor, sh); + init_async_submit(&submit, ASYNC_TX_FENCE|ASYNC_TX_XOR_DROP_DST, tx, + ops_complete_prexor, sh, to_addr_conv(sh, percpu)); + tx = async_xor(xor_dest, xor_srcs, 0, count, STRIPE_SIZE, &submit); return tx; } @@ -742,17 +970,21 @@ ops_run_biodrain(struct stripe_head *sh, struct dma_async_tx_descriptor *tx) return tx; } -static void ops_complete_postxor(void *stripe_head_ref) +static void ops_complete_reconstruct(void *stripe_head_ref) { struct stripe_head *sh = stripe_head_ref; - int disks = sh->disks, i, pd_idx = sh->pd_idx; + int disks = sh->disks; + int pd_idx = sh->pd_idx; + int qd_idx = sh->qd_idx; + int i; pr_debug("%s: stripe %llu\n", __func__, (unsigned long long)sh->sector); for (i = disks; i--; ) { struct r5dev *dev = &sh->dev[i]; - if (dev->written || i == pd_idx) + + if (dev->written || i == pd_idx || i == qd_idx) set_bit(R5_UPTODATE, &dev->flags); } @@ -770,12 +1002,12 @@ static void ops_complete_postxor(void *stripe_head_ref) } static void -ops_run_postxor(struct stripe_head *sh, struct dma_async_tx_descriptor *tx) +ops_run_reconstruct5(struct stripe_head *sh, struct raid5_percpu *percpu, + struct dma_async_tx_descriptor *tx) { - /* kernel stack size limits the total number of disks */ int disks = sh->disks; - struct page *xor_srcs[disks]; - + struct page **xor_srcs = percpu->scribble; + struct async_submit_ctl submit; int count = 0, pd_idx = sh->pd_idx, i; struct page *xor_dest; int prexor = 0; @@ -809,18 +1041,36 @@ ops_run_postxor(struct stripe_head *sh, struct dma_async_tx_descriptor *tx) * set ASYNC_TX_XOR_DROP_DST and ASYNC_TX_XOR_ZERO_DST * for the synchronous xor case */ - flags = ASYNC_TX_DEP_ACK | ASYNC_TX_ACK | + flags = ASYNC_TX_ACK | (prexor ? ASYNC_TX_XOR_DROP_DST : ASYNC_TX_XOR_ZERO_DST); atomic_inc(&sh->count); - if (unlikely(count == 1)) { - flags &= ~(ASYNC_TX_XOR_DROP_DST | ASYNC_TX_XOR_ZERO_DST); - tx = async_memcpy(xor_dest, xor_srcs[0], 0, 0, STRIPE_SIZE, - flags, tx, ops_complete_postxor, sh); - } else - tx = async_xor(xor_dest, xor_srcs, 0, count, STRIPE_SIZE, - flags, tx, ops_complete_postxor, sh); + init_async_submit(&submit, flags, tx, ops_complete_reconstruct, sh, + to_addr_conv(sh, percpu)); + if (unlikely(count == 1)) + tx = async_memcpy(xor_dest, xor_srcs[0], 0, 0, STRIPE_SIZE, &submit); + else + tx = async_xor(xor_dest, xor_srcs, 0, count, STRIPE_SIZE, &submit); +} + +static void +ops_run_reconstruct6(struct stripe_head *sh, struct raid5_percpu *percpu, + struct dma_async_tx_descriptor *tx) +{ + struct async_submit_ctl submit; + struct page **blocks = percpu->scribble; + int count; + + pr_debug("%s: stripe %llu\n", __func__, (unsigned long long)sh->sector); + + count = set_syndrome_sources(blocks, sh); + + atomic_inc(&sh->count); + + init_async_submit(&submit, ASYNC_TX_ACK, tx, ops_complete_reconstruct, + sh, to_addr_conv(sh, percpu)); + async_gen_syndrome(blocks, 0, count+2, STRIPE_SIZE, &submit); } static void ops_complete_check(void *stripe_head_ref) @@ -835,63 +1085,115 @@ static void ops_complete_check(void *stripe_head_ref) release_stripe(sh); } -static void ops_run_check(struct stripe_head *sh) +static void ops_run_check_p(struct stripe_head *sh, struct raid5_percpu *percpu) { - /* kernel stack size limits the total number of disks */ int disks = sh->disks; - struct page *xor_srcs[disks]; + int pd_idx = sh->pd_idx; + int qd_idx = sh->qd_idx; + struct page *xor_dest; + struct page **xor_srcs = percpu->scribble; struct dma_async_tx_descriptor *tx; - - int count = 0, pd_idx = sh->pd_idx, i; - struct page *xor_dest = xor_srcs[count++] = sh->dev[pd_idx].page; + struct async_submit_ctl submit; + int count; + int i; pr_debug("%s: stripe %llu\n", __func__, (unsigned long long)sh->sector); + count = 0; + xor_dest = sh->dev[pd_idx].page; + xor_srcs[count++] = xor_dest; for (i = disks; i--; ) { - struct r5dev *dev = &sh->dev[i]; - if (i != pd_idx) - xor_srcs[count++] = dev->page; + if (i == pd_idx || i == qd_idx) + continue; + xor_srcs[count++] = sh->dev[i].page; } - tx = async_xor_zero_sum(xor_dest, xor_srcs, 0, count, STRIPE_SIZE, - &sh->ops.zero_sum_result, 0, NULL, NULL, NULL); + init_async_submit(&submit, 0, NULL, NULL, NULL, + to_addr_conv(sh, percpu)); + tx = async_xor_val(xor_dest, xor_srcs, 0, count, STRIPE_SIZE, + &sh->ops.zero_sum_result, &submit); + + atomic_inc(&sh->count); + init_async_submit(&submit, ASYNC_TX_ACK, tx, ops_complete_check, sh, NULL); + tx = async_trigger_callback(&submit); +} + +static void ops_run_check_pq(struct stripe_head *sh, struct raid5_percpu *percpu, int checkp) +{ + struct page **srcs = percpu->scribble; + struct async_submit_ctl submit; + int count; + + pr_debug("%s: stripe %llu checkp: %d\n", __func__, + (unsigned long long)sh->sector, checkp); + + count = set_syndrome_sources(srcs, sh); + if (!checkp) + srcs[count] = NULL; atomic_inc(&sh->count); - tx = async_trigger_callback(ASYNC_TX_DEP_ACK | ASYNC_TX_ACK, tx, - ops_complete_check, sh); + init_async_submit(&submit, ASYNC_TX_ACK, NULL, ops_complete_check, + sh, to_addr_conv(sh, percpu)); + async_syndrome_val(srcs, 0, count+2, STRIPE_SIZE, + &sh->ops.zero_sum_result, percpu->spare_page, &submit); } -static void raid5_run_ops(struct stripe_head *sh, unsigned long ops_request) +static void raid_run_ops(struct stripe_head *sh, unsigned long ops_request) { int overlap_clear = 0, i, disks = sh->disks; struct dma_async_tx_descriptor *tx = NULL; + raid5_conf_t *conf = sh->raid_conf; + int level = conf->level; + struct raid5_percpu *percpu; + unsigned long cpu; + cpu = get_cpu(); + percpu = per_cpu_ptr(conf->percpu, cpu); if (test_bit(STRIPE_OP_BIOFILL, &ops_request)) { ops_run_biofill(sh); overlap_clear++; } if (test_bit(STRIPE_OP_COMPUTE_BLK, &ops_request)) { - tx = ops_run_compute5(sh); - /* terminate the chain if postxor is not set to be run */ - if (tx && !test_bit(STRIPE_OP_POSTXOR, &ops_request)) + if (level < 6) + tx = ops_run_compute5(sh, percpu); + else { + if (sh->ops.target2 < 0 || sh->ops.target < 0) + tx = ops_run_compute6_1(sh, percpu); + else + tx = ops_run_compute6_2(sh, percpu); + } + /* terminate the chain if reconstruct is not set to be run */ + if (tx && !test_bit(STRIPE_OP_RECONSTRUCT, &ops_request)) async_tx_ack(tx); } if (test_bit(STRIPE_OP_PREXOR, &ops_request)) - tx = ops_run_prexor(sh, tx); + tx = ops_run_prexor(sh, percpu, tx); if (test_bit(STRIPE_OP_BIODRAIN, &ops_request)) { tx = ops_run_biodrain(sh, tx); overlap_clear++; } - if (test_bit(STRIPE_OP_POSTXOR, &ops_request)) - ops_run_postxor(sh, tx); + if (test_bit(STRIPE_OP_RECONSTRUCT, &ops_request)) { + if (level < 6) + ops_run_reconstruct5(sh, percpu, tx); + else + ops_run_reconstruct6(sh, percpu, tx); + } - if (test_bit(STRIPE_OP_CHECK, &ops_request)) - ops_run_check(sh); + if (test_bit(STRIPE_OP_CHECK, &ops_request)) { + if (sh->check_state == check_state_run) + ops_run_check_p(sh, percpu); + else if (sh->check_state == check_state_run_q) + ops_run_check_pq(sh, percpu, 0); + else if (sh->check_state == check_state_run_pq) + ops_run_check_pq(sh, percpu, 1); + else + BUG(); + } if (overlap_clear) for (i = disks; i--; ) { @@ -899,6 +1201,7 @@ static void raid5_run_ops(struct stripe_head *sh, unsigned long ops_request) if (test_and_clear_bit(R5_Overlap, &dev->flags)) wake_up(&sh->raid_conf->wait_for_overlap); } + put_cpu(); } static int grow_one_stripe(raid5_conf_t *conf) @@ -948,6 +1251,28 @@ static int grow_stripes(raid5_conf_t *conf, int num) return 0; } +/** + * scribble_len - return the required size of the scribble region + * @num - total number of disks in the array + * + * The size must be enough to contain: + * 1/ a struct page pointer for each device in the array +2 + * 2/ room to convert each entry in (1) to its corresponding dma + * (dma_map_page()) or page (page_address()) address. + * + * Note: the +2 is for the destination buffers of the ddf/raid6 case where we + * calculate over all devices (not just the data blocks), using zeros in place + * of the P and Q blocks. + */ +static size_t scribble_len(int num) +{ + size_t len; + + len = sizeof(struct page *) * (num+2) + sizeof(addr_conv_t) * (num+2); + + return len; +} + static int resize_stripes(raid5_conf_t *conf, int newsize) { /* Make all the stripes able to hold 'newsize' devices. @@ -976,6 +1301,7 @@ static int resize_stripes(raid5_conf_t *conf, int newsize) struct stripe_head *osh, *nsh; LIST_HEAD(newstripes); struct disk_info *ndisks; + unsigned long cpu; int err; struct kmem_cache *sc; int i; @@ -1041,7 +1367,7 @@ static int resize_stripes(raid5_conf_t *conf, int newsize) /* Step 3. * At this point, we are holding all the stripes so the array * is completely stalled, so now is a good time to resize - * conf->disks. + * conf->disks and the scribble region */ ndisks = kzalloc(newsize * sizeof(struct disk_info), GFP_NOIO); if (ndisks) { @@ -1052,10 +1378,30 @@ static int resize_stripes(raid5_conf_t *conf, int newsize) } else err = -ENOMEM; + get_online_cpus(); + conf->scribble_len = scribble_len(newsize); + for_each_present_cpu(cpu) { + struct raid5_percpu *percpu; + void *scribble; + + percpu = per_cpu_ptr(conf->percpu, cpu); + scribble = kmalloc(conf->scribble_len, GFP_NOIO); + + if (scribble) { + kfree(percpu->scribble); + percpu->scribble = scribble; + } else { + err = -ENOMEM; + break; + } + } + put_online_cpus(); + /* Step 4, return new stripes to service */ while(!list_empty(&newstripes)) { nsh = list_entry(newstripes.next, struct stripe_head, lru); list_del_init(&nsh->lru); + for (i=conf->raid_disks; i < newsize; i++) if (nsh->dev[i].page == NULL) { struct page *p = alloc_page(GFP_NOIO); @@ -1594,258 +1940,13 @@ static sector_t compute_blocknr(struct stripe_head *sh, int i, int previous) } - -/* - * Copy data between a page in the stripe cache, and one or more bion - * The page could align with the middle of the bio, or there could be - * several bion, each with several bio_vecs, which cover part of the page - * Multiple bion are linked together on bi_next. There may be extras - * at the end of this list. We ignore them. - */ -static void copy_data(int frombio, struct bio *bio, - struct page *page, - sector_t sector) -{ - char *pa = page_address(page); - struct bio_vec *bvl; - int i; - int page_offset; - - if (bio->bi_sector >= sector) - page_offset = (signed)(bio->bi_sector - sector) * 512; - else - page_offset = (signed)(sector - bio->bi_sector) * -512; - bio_for_each_segment(bvl, bio, i) { - int len = bio_iovec_idx(bio,i)->bv_len; - int clen; - int b_offset = 0; - - if (page_offset < 0) { - b_offset = -page_offset; - page_offset += b_offset; - len -= b_offset; - } - - if (len > 0 && page_offset + len > STRIPE_SIZE) - clen = STRIPE_SIZE - page_offset; - else clen = len; - - if (clen > 0) { - char *ba = __bio_kmap_atomic(bio, i, KM_USER0); - if (frombio) - memcpy(pa+page_offset, ba+b_offset, clen); - else - memcpy(ba+b_offset, pa+page_offset, clen); - __bio_kunmap_atomic(ba, KM_USER0); - } - if (clen < len) /* hit end of page */ - break; - page_offset += len; - } -} - -#define check_xor() do { \ - if (count == MAX_XOR_BLOCKS) { \ - xor_blocks(count, STRIPE_SIZE, dest, ptr);\ - count = 0; \ - } \ - } while(0) - -static void compute_parity6(struct stripe_head *sh, int method) -{ - raid5_conf_t *conf = sh->raid_conf; - int i, pd_idx, qd_idx, d0_idx, disks = sh->disks, count; - int syndrome_disks = sh->ddf_layout ? disks : (disks - 2); - struct bio *chosen; - /**** FIX THIS: This could be very bad if disks is close to 256 ****/ - void *ptrs[syndrome_disks+2]; - - pd_idx = sh->pd_idx; - qd_idx = sh->qd_idx; - d0_idx = raid6_d0(sh); - - pr_debug("compute_parity, stripe %llu, method %d\n", - (unsigned long long)sh->sector, method); - - switch(method) { - case READ_MODIFY_WRITE: - BUG(); /* READ_MODIFY_WRITE N/A for RAID-6 */ - case RECONSTRUCT_WRITE: - for (i= disks; i-- ;) - if ( i != pd_idx && i != qd_idx && sh->dev[i].towrite ) { - chosen = sh->dev[i].towrite; - sh->dev[i].towrite = NULL; - - if (test_and_clear_bit(R5_Overlap, &sh->dev[i].flags)) - wake_up(&conf->wait_for_overlap); - - BUG_ON(sh->dev[i].written); - sh->dev[i].written = chosen; - } - break; - case CHECK_PARITY: - BUG(); /* Not implemented yet */ - } - - for (i = disks; i--;) - if (sh->dev[i].written) { - sector_t sector = sh->dev[i].sector; - struct bio *wbi = sh->dev[i].written; - while (wbi && wbi->bi_sector < sector + STRIPE_SECTORS) { - copy_data(1, wbi, sh->dev[i].page, sector); - wbi = r5_next_bio(wbi, sector); - } - - set_bit(R5_LOCKED, &sh->dev[i].flags); - set_bit(R5_UPTODATE, &sh->dev[i].flags); - } - - /* Note that unlike RAID-5, the ordering of the disks matters greatly.*/ - - for (i = 0; i < disks; i++) - ptrs[i] = (void *)raid6_empty_zero_page; - - count = 0; - i = d0_idx; - do { - int slot = raid6_idx_to_slot(i, sh, &count, syndrome_disks); - - ptrs[slot] = page_address(sh->dev[i].page); - if (slot < syndrome_disks && - !test_bit(R5_UPTODATE, &sh->dev[i].flags)) { - printk(KERN_ERR "block %d/%d not uptodate " - "on parity calc\n", i, count); - BUG(); - } - - i = raid6_next_disk(i, disks); - } while (i != d0_idx); - BUG_ON(count != syndrome_disks); - - raid6_call.gen_syndrome(syndrome_disks+2, STRIPE_SIZE, ptrs); - - switch(method) { - case RECONSTRUCT_WRITE: - set_bit(R5_UPTODATE, &sh->dev[pd_idx].flags); - set_bit(R5_UPTODATE, &sh->dev[qd_idx].flags); - set_bit(R5_LOCKED, &sh->dev[pd_idx].flags); - set_bit(R5_LOCKED, &sh->dev[qd_idx].flags); - break; - case UPDATE_PARITY: - set_bit(R5_UPTODATE, &sh->dev[pd_idx].flags); - set_bit(R5_UPTODATE, &sh->dev[qd_idx].flags); - break; - } -} - - -/* Compute one missing block */ -static void compute_block_1(struct stripe_head *sh, int dd_idx, int nozero) -{ - int i, count, disks = sh->disks; - void *ptr[MAX_XOR_BLOCKS], *dest, *p; - int qd_idx = sh->qd_idx; - - pr_debug("compute_block_1, stripe %llu, idx %d\n", - (unsigned long long)sh->sector, dd_idx); - - if ( dd_idx == qd_idx ) { - /* We're actually computing the Q drive */ - compute_parity6(sh, UPDATE_PARITY); - } else { - dest = page_address(sh->dev[dd_idx].page); - if (!nozero) memset(dest, 0, STRIPE_SIZE); - count = 0; - for (i = disks ; i--; ) { - if (i == dd_idx || i == qd_idx) - continue; - p = page_address(sh->dev[i].page); - if (test_bit(R5_UPTODATE, &sh->dev[i].flags)) - ptr[count++] = p; - else - printk("compute_block() %d, stripe %llu, %d" - " not present\n", dd_idx, - (unsigned long long)sh->sector, i); - - check_xor(); - } - if (count) - xor_blocks(count, STRIPE_SIZE, dest, ptr); - if (!nozero) set_bit(R5_UPTODATE, &sh->dev[dd_idx].flags); - else clear_bit(R5_UPTODATE, &sh->dev[dd_idx].flags); - } -} - -/* Compute two missing blocks */ -static void compute_block_2(struct stripe_head *sh, int dd_idx1, int dd_idx2) -{ - int i, count, disks = sh->disks; - int syndrome_disks = sh->ddf_layout ? disks : disks-2; - int d0_idx = raid6_d0(sh); - int faila = -1, failb = -1; - /**** FIX THIS: This could be very bad if disks is close to 256 ****/ - void *ptrs[syndrome_disks+2]; - - for (i = 0; i < disks ; i++) - ptrs[i] = (void *)raid6_empty_zero_page; - count = 0; - i = d0_idx; - do { - int slot = raid6_idx_to_slot(i, sh, &count, syndrome_disks); - - ptrs[slot] = page_address(sh->dev[i].page); - - if (i == dd_idx1) - faila = slot; - if (i == dd_idx2) - failb = slot; - i = raid6_next_disk(i, disks); - } while (i != d0_idx); - BUG_ON(count != syndrome_disks); - - BUG_ON(faila == failb); - if ( failb < faila ) { int tmp = faila; faila = failb; failb = tmp; } - - pr_debug("compute_block_2, stripe %llu, idx %d,%d (%d,%d)\n", - (unsigned long long)sh->sector, dd_idx1, dd_idx2, - faila, failb); - - if (failb == syndrome_disks+1) { - /* Q disk is one of the missing disks */ - if (faila == syndrome_disks) { - /* Missing P+Q, just recompute */ - compute_parity6(sh, UPDATE_PARITY); - return; - } else { - /* We're missing D+Q; recompute D from P */ - compute_block_1(sh, ((dd_idx1 == sh->qd_idx) ? - dd_idx2 : dd_idx1), - 0); - compute_parity6(sh, UPDATE_PARITY); /* Is this necessary? */ - return; - } - } - - /* We're missing D+P or D+D; */ - if (failb == syndrome_disks) { - /* We're missing D+P. */ - raid6_datap_recov(syndrome_disks+2, STRIPE_SIZE, faila, ptrs); - } else { - /* We're missing D+D. */ - raid6_2data_recov(syndrome_disks+2, STRIPE_SIZE, faila, failb, - ptrs); - } - - /* Both the above update both missing blocks */ - set_bit(R5_UPTODATE, &sh->dev[dd_idx1].flags); - set_bit(R5_UPTODATE, &sh->dev[dd_idx2].flags); -} - static void -schedule_reconstruction5(struct stripe_head *sh, struct stripe_head_state *s, +schedule_reconstruction(struct stripe_head *sh, struct stripe_head_state *s, int rcw, int expand) { int i, pd_idx = sh->pd_idx, disks = sh->disks; + raid5_conf_t *conf = sh->raid_conf; + int level = conf->level; if (rcw) { /* if we are not expanding this is a proper write request, and @@ -1858,7 +1959,7 @@ schedule_reconstruction5(struct stripe_head *sh, struct stripe_head_state *s, } else sh->reconstruct_state = reconstruct_state_run; - set_bit(STRIPE_OP_POSTXOR, &s->ops_request); + set_bit(STRIPE_OP_RECONSTRUCT, &s->ops_request); for (i = disks; i--; ) { struct r5dev *dev = &sh->dev[i]; @@ -1871,17 +1972,18 @@ schedule_reconstruction5(struct stripe_head *sh, struct stripe_head_state *s, s->locked++; } } - if (s->locked + 1 == disks) + if (s->locked + conf->max_degraded == disks) if (!test_and_set_bit(STRIPE_FULL_WRITE, &sh->state)) - atomic_inc(&sh->raid_conf->pending_full_writes); + atomic_inc(&conf->pending_full_writes); } else { + BUG_ON(level == 6); BUG_ON(!(test_bit(R5_UPTODATE, &sh->dev[pd_idx].flags) || test_bit(R5_Wantcompute, &sh->dev[pd_idx].flags))); sh->reconstruct_state = reconstruct_state_prexor_drain_run; set_bit(STRIPE_OP_PREXOR, &s->ops_request); set_bit(STRIPE_OP_BIODRAIN, &s->ops_request); - set_bit(STRIPE_OP_POSTXOR, &s->ops_request); + set_bit(STRIPE_OP_RECONSTRUCT, &s->ops_request); for (i = disks; i--; ) { struct r5dev *dev = &sh->dev[i]; @@ -1899,13 +2001,22 @@ schedule_reconstruction5(struct stripe_head *sh, struct stripe_head_state *s, } } - /* keep the parity disk locked while asynchronous operations + /* keep the parity disk(s) locked while asynchronous operations * are in flight */ set_bit(R5_LOCKED, &sh->dev[pd_idx].flags); clear_bit(R5_UPTODATE, &sh->dev[pd_idx].flags); s->locked++; + if (level == 6) { + int qd_idx = sh->qd_idx; + struct r5dev *dev = &sh->dev[qd_idx]; + + set_bit(R5_LOCKED, &dev->flags); + clear_bit(R5_UPTODATE, &dev->flags); + s->locked++; + } + pr_debug("%s: stripe %llu locked: %d ops_request: %lx\n", __func__, (unsigned long long)sh->sector, s->locked, s->ops_request); @@ -1986,13 +2097,6 @@ static int add_stripe_bio(struct stripe_head *sh, struct bio *bi, int dd_idx, in static void end_reshape(raid5_conf_t *conf); -static int page_is_zero(struct page *p) -{ - char *a = page_address(p); - return ((*(u32*)a) == 0 && - memcmp(a, a+4, STRIPE_SIZE-4)==0); -} - static void stripe_set_idx(sector_t stripe, raid5_conf_t *conf, int previous, struct stripe_head *sh) { @@ -2132,9 +2236,10 @@ static int fetch_block5(struct stripe_head *sh, struct stripe_head_state *s, set_bit(STRIPE_OP_COMPUTE_BLK, &s->ops_request); set_bit(R5_Wantcompute, &dev->flags); sh->ops.target = disk_idx; + sh->ops.target2 = -1; s->req_compute = 1; /* Careful: from this point on 'uptodate' is in the eye - * of raid5_run_ops which services 'compute' operations + * of raid_run_ops which services 'compute' operations * before writes. R5_Wantcompute flags a block that will * be R5_UPTODATE by the time it is needed for a * subsequent operation. @@ -2173,61 +2278,104 @@ static void handle_stripe_fill5(struct stripe_head *sh, set_bit(STRIPE_HANDLE, &sh->state); } -static void handle_stripe_fill6(struct stripe_head *sh, - struct stripe_head_state *s, struct r6_state *r6s, - int disks) +/* fetch_block6 - checks the given member device to see if its data needs + * to be read or computed to satisfy a request. + * + * Returns 1 when no more member devices need to be checked, otherwise returns + * 0 to tell the loop in handle_stripe_fill6 to continue + */ +static int fetch_block6(struct stripe_head *sh, struct stripe_head_state *s, + struct r6_state *r6s, int disk_idx, int disks) { - int i; - for (i = disks; i--; ) { - struct r5dev *dev = &sh->dev[i]; - if (!test_bit(R5_LOCKED, &dev->flags) && - !test_bit(R5_UPTODATE, &dev->flags) && - (dev->toread || (dev->towrite && - !test_bit(R5_OVERWRITE, &dev->flags)) || - s->syncing || s->expanding || - (s->failed >= 1 && - (sh->dev[r6s->failed_num[0]].toread || - s->to_write)) || - (s->failed >= 2 && - (sh->dev[r6s->failed_num[1]].toread || - s->to_write)))) { - /* we would like to get this block, possibly - * by computing it, but we might not be able to + struct r5dev *dev = &sh->dev[disk_idx]; + struct r5dev *fdev[2] = { &sh->dev[r6s->failed_num[0]], + &sh->dev[r6s->failed_num[1]] }; + + if (!test_bit(R5_LOCKED, &dev->flags) && + !test_bit(R5_UPTODATE, &dev->flags) && + (dev->toread || + (dev->towrite && !test_bit(R5_OVERWRITE, &dev->flags)) || + s->syncing || s->expanding || + (s->failed >= 1 && + (fdev[0]->toread || s->to_write)) || + (s->failed >= 2 && + (fdev[1]->toread || s->to_write)))) { + /* we would like to get this block, possibly by computing it, + * otherwise read it if the backing disk is insync + */ + BUG_ON(test_bit(R5_Wantcompute, &dev->flags)); + BUG_ON(test_bit(R5_Wantread, &dev->flags)); + if ((s->uptodate == disks - 1) && + (s->failed && (disk_idx == r6s->failed_num[0] || + disk_idx == r6s->failed_num[1]))) { + /* have disk failed, and we're requested to fetch it; + * do compute it */ - if ((s->uptodate == disks - 1) && - (s->failed && (i == r6s->failed_num[0] || - i == r6s->failed_num[1]))) { - pr_debug("Computing stripe %llu block %d\n", - (unsigned long long)sh->sector, i); - compute_block_1(sh, i, 0); - s->uptodate++; - } else if ( s->uptodate == disks-2 && s->failed >= 2 ) { - /* Computing 2-failure is *very* expensive; only - * do it if failed >= 2 - */ - int other; - for (other = disks; other--; ) { - if (other == i) - continue; - if (!test_bit(R5_UPTODATE, - &sh->dev[other].flags)) - break; - } - BUG_ON(other < 0); - pr_debug("Computing stripe %llu blocks %d,%d\n", - (unsigned long long)sh->sector, - i, other); - compute_block_2(sh, i, other); - s->uptodate += 2; - } else if (test_bit(R5_Insync, &dev->flags)) { - set_bit(R5_LOCKED, &dev->flags); - set_bit(R5_Wantread, &dev->flags); - s->locked++; - pr_debug("Reading block %d (sync=%d)\n", - i, s->syncing); + pr_debug("Computing stripe %llu block %d\n", + (unsigned long long)sh->sector, disk_idx); + set_bit(STRIPE_COMPUTE_RUN, &sh->state); + set_bit(STRIPE_OP_COMPUTE_BLK, &s->ops_request); + set_bit(R5_Wantcompute, &dev->flags); + sh->ops.target = disk_idx; + sh->ops.target2 = -1; /* no 2nd target */ + s->req_compute = 1; + s->uptodate++; + return 1; + } else if (s->uptodate == disks-2 && s->failed >= 2) { + /* Computing 2-failure is *very* expensive; only + * do it if failed >= 2 + */ + int other; + for (other = disks; other--; ) { + if (other == disk_idx) + continue; + if (!test_bit(R5_UPTODATE, + &sh->dev[other].flags)) + break; } + BUG_ON(other < 0); + pr_debug("Computing stripe %llu blocks %d,%d\n", + (unsigned long long)sh->sector, + disk_idx, other); + set_bit(STRIPE_COMPUTE_RUN, &sh->state); + set_bit(STRIPE_OP_COMPUTE_BLK, &s->ops_request); + set_bit(R5_Wantcompute, &sh->dev[disk_idx].flags); + set_bit(R5_Wantcompute, &sh->dev[other].flags); + sh->ops.target = disk_idx; + sh->ops.target2 = other; + s->uptodate += 2; + s->req_compute = 1; + return 1; + } else if (test_bit(R5_Insync, &dev->flags)) { + set_bit(R5_LOCKED, &dev->flags); + set_bit(R5_Wantread, &dev->flags); + s->locked++; + pr_debug("Reading block %d (sync=%d)\n", + disk_idx, s->syncing); } } + + return 0; +} + +/** + * handle_stripe_fill6 - read or compute data to satisfy pending requests. + */ +static void handle_stripe_fill6(struct stripe_head *sh, + struct stripe_head_state *s, struct r6_state *r6s, + int disks) +{ + int i; + + /* look for blocks to read/compute, skip this if a compute + * is already in flight, or if the stripe contents are in the + * midst of changing due to a write + */ + if (!test_bit(STRIPE_COMPUTE_RUN, &sh->state) && !sh->check_state && + !sh->reconstruct_state) + for (i = disks; i--; ) + if (fetch_block6(sh, s, r6s, i, disks)) + break; set_bit(STRIPE_HANDLE, &sh->state); } @@ -2361,114 +2509,61 @@ static void handle_stripe_dirtying5(raid5_conf_t *conf, */ /* since handle_stripe can be called at any time we need to handle the * case where a compute block operation has been submitted and then a - * subsequent call wants to start a write request. raid5_run_ops only - * handles the case where compute block and postxor are requested + * subsequent call wants to start a write request. raid_run_ops only + * handles the case where compute block and reconstruct are requested * simultaneously. If this is not the case then new writes need to be * held off until the compute completes. */ if ((s->req_compute || !test_bit(STRIPE_COMPUTE_RUN, &sh->state)) && (s->locked == 0 && (rcw == 0 || rmw == 0) && !test_bit(STRIPE_BIT_DELAY, &sh->state))) - schedule_reconstruction5(sh, s, rcw == 0, 0); + schedule_reconstruction(sh, s, rcw == 0, 0); } static void handle_stripe_dirtying6(raid5_conf_t *conf, struct stripe_head *sh, struct stripe_head_state *s, struct r6_state *r6s, int disks) { - int rcw = 0, must_compute = 0, pd_idx = sh->pd_idx, i; + int rcw = 0, pd_idx = sh->pd_idx, i; int qd_idx = sh->qd_idx; + + set_bit(STRIPE_HANDLE, &sh->state); for (i = disks; i--; ) { struct r5dev *dev = &sh->dev[i]; - /* Would I have to read this buffer for reconstruct_write */ - if (!test_bit(R5_OVERWRITE, &dev->flags) - && i != pd_idx && i != qd_idx - && (!test_bit(R5_LOCKED, &dev->flags) - ) && - !test_bit(R5_UPTODATE, &dev->flags)) { - if (test_bit(R5_Insync, &dev->flags)) rcw++; - else { - pr_debug("raid6: must_compute: " - "disk %d flags=%#lx\n", i, dev->flags); - must_compute++; + /* check if we haven't enough data */ + if (!test_bit(R5_OVERWRITE, &dev->flags) && + i != pd_idx && i != qd_idx && + !test_bit(R5_LOCKED, &dev->flags) && + !(test_bit(R5_UPTODATE, &dev->flags) || + test_bit(R5_Wantcompute, &dev->flags))) { + rcw++; + if (!test_bit(R5_Insync, &dev->flags)) + continue; /* it's a failed drive */ + + if ( + test_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) { + pr_debug("Read_old stripe %llu " + "block %d for Reconstruct\n", + (unsigned long long)sh->sector, i); + set_bit(R5_LOCKED, &dev->flags); + set_bit(R5_Wantread, &dev->flags); + s->locked++; + } else { + pr_debug("Request delayed stripe %llu " + "block %d for Reconstruct\n", + (unsigned long long)sh->sector, i); + set_bit(STRIPE_DELAYED, &sh->state); + set_bit(STRIPE_HANDLE, &sh->state); } } } - pr_debug("for sector %llu, rcw=%d, must_compute=%d\n", - (unsigned long long)sh->sector, rcw, must_compute); - set_bit(STRIPE_HANDLE, &sh->state); - - if (rcw > 0) - /* want reconstruct write, but need to get some data */ - for (i = disks; i--; ) { - struct r5dev *dev = &sh->dev[i]; - if (!test_bit(R5_OVERWRITE, &dev->flags) - && !(s->failed == 0 && (i == pd_idx || i == qd_idx)) - && !test_bit(R5_LOCKED, &dev->flags) && - !test_bit(R5_UPTODATE, &dev->flags) && - test_bit(R5_Insync, &dev->flags)) { - if ( - test_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) { - pr_debug("Read_old stripe %llu " - "block %d for Reconstruct\n", - (unsigned long long)sh->sector, i); - set_bit(R5_LOCKED, &dev->flags); - set_bit(R5_Wantread, &dev->flags); - s->locked++; - } else { - pr_debug("Request delayed stripe %llu " - "block %d for Reconstruct\n", - (unsigned long long)sh->sector, i); - set_bit(STRIPE_DELAYED, &sh->state); - set_bit(STRIPE_HANDLE, &sh->state); - } - } - } /* now if nothing is locked, and if we have enough data, we can start a * write request */ - if (s->locked == 0 && rcw == 0 && + if ((s->req_compute || !test_bit(STRIPE_COMPUTE_RUN, &sh->state)) && + s->locked == 0 && rcw == 0 && !test_bit(STRIPE_BIT_DELAY, &sh->state)) { - if (must_compute > 0) { - /* We have failed blocks and need to compute them */ - switch (s->failed) { - case 0: - BUG(); - case 1: - compute_block_1(sh, r6s->failed_num[0], 0); - break; - case 2: - compute_block_2(sh, r6s->failed_num[0], - r6s->failed_num[1]); - break; - default: /* This request should have been failed? */ - BUG(); - } - } - - pr_debug("Computing parity for stripe %llu\n", - (unsigned long long)sh->sector); - compute_parity6(sh, RECONSTRUCT_WRITE); - /* now every locked buffer is ready to be written */ - for (i = disks; i--; ) - if (test_bit(R5_LOCKED, &sh->dev[i].flags)) { - pr_debug("Writing stripe %llu block %d\n", - (unsigned long long)sh->sector, i); - s->locked++; - set_bit(R5_Wantwrite, &sh->dev[i].flags); - } - if (s->locked == disks) - if (!test_and_set_bit(STRIPE_FULL_WRITE, &sh->state)) - atomic_inc(&conf->pending_full_writes); - /* after a RECONSTRUCT_WRITE, the stripe MUST be in-sync */ - set_bit(STRIPE_INSYNC, &sh->state); - - if (test_and_clear_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) { - atomic_dec(&conf->preread_active_stripes); - if (atomic_read(&conf->preread_active_stripes) < - IO_THRESHOLD) - md_wakeup_thread(conf->mddev->thread); - } + schedule_reconstruction(sh, s, 1, 0); } } @@ -2527,7 +2622,7 @@ static void handle_parity_checks5(raid5_conf_t *conf, struct stripe_head *sh, * we are done. Otherwise update the mismatch count and repair * parity if !MD_RECOVERY_CHECK */ - if (sh->ops.zero_sum_result == 0) + if ((sh->ops.zero_sum_result & SUM_CHECK_P_RESULT) == 0) /* parity is correct (on disc, * not in buffer any more) */ @@ -2544,6 +2639,7 @@ static void handle_parity_checks5(raid5_conf_t *conf, struct stripe_head *sh, set_bit(R5_Wantcompute, &sh->dev[sh->pd_idx].flags); sh->ops.target = sh->pd_idx; + sh->ops.target2 = -1; s->uptodate++; } } @@ -2560,67 +2656,74 @@ static void handle_parity_checks5(raid5_conf_t *conf, struct stripe_head *sh, static void handle_parity_checks6(raid5_conf_t *conf, struct stripe_head *sh, - struct stripe_head_state *s, - struct r6_state *r6s, struct page *tmp_page, - int disks) + struct stripe_head_state *s, + struct r6_state *r6s, int disks) { - int update_p = 0, update_q = 0; - struct r5dev *dev; int pd_idx = sh->pd_idx; int qd_idx = sh->qd_idx; + struct r5dev *dev; set_bit(STRIPE_HANDLE, &sh->state); BUG_ON(s->failed > 2); - BUG_ON(s->uptodate < disks); + /* Want to check and possibly repair P and Q. * However there could be one 'failed' device, in which * case we can only check one of them, possibly using the * other to generate missing data */ - /* If !tmp_page, we cannot do the calculations, - * but as we have set STRIPE_HANDLE, we will soon be called - * by stripe_handle with a tmp_page - just wait until then. - */ - if (tmp_page) { + switch (sh->check_state) { + case check_state_idle: + /* start a new check operation if there are < 2 failures */ if (s->failed == r6s->q_failed) { - /* The only possible failed device holds 'Q', so it + /* The only possible failed device holds Q, so it * makes sense to check P (If anything else were failed, * we would have used P to recreate it). */ - compute_block_1(sh, pd_idx, 1); - if (!page_is_zero(sh->dev[pd_idx].page)) { - compute_block_1(sh, pd_idx, 0); - update_p = 1; - } + sh->check_state = check_state_run; } if (!r6s->q_failed && s->failed < 2) { - /* q is not failed, and we didn't use it to generate + /* Q is not failed, and we didn't use it to generate * anything, so it makes sense to check it */ - memcpy(page_address(tmp_page), - page_address(sh->dev[qd_idx].page), - STRIPE_SIZE); - compute_parity6(sh, UPDATE_PARITY); - if (memcmp(page_address(tmp_page), - page_address(sh->dev[qd_idx].page), - STRIPE_SIZE) != 0) { - clear_bit(STRIPE_INSYNC, &sh->state); - update_q = 1; - } + if (sh->check_state == check_state_run) + sh->check_state = check_state_run_pq; + else + sh->check_state = check_state_run_q; } - if (update_p || update_q) { - conf->mddev->resync_mismatches += STRIPE_SECTORS; - if (test_bit(MD_RECOVERY_CHECK, &conf->mddev->recovery)) - /* don't try to repair!! */ - update_p = update_q = 0; + + /* discard potentially stale zero_sum_result */ + sh->ops.zero_sum_result = 0; + + if (sh->check_state == check_state_run) { + /* async_xor_zero_sum destroys the contents of P */ + clear_bit(R5_UPTODATE, &sh->dev[pd_idx].flags); + s->uptodate--; + } + if (sh->check_state >= check_state_run && + sh->check_state <= check_state_run_pq) { + /* async_syndrome_zero_sum preserves P and Q, so + * no need to mark them !uptodate here + */ + set_bit(STRIPE_OP_CHECK, &s->ops_request); + break; } + /* we have 2-disk failure */ + BUG_ON(s->failed != 2); + /* fall through */ + case check_state_compute_result: + sh->check_state = check_state_idle; + + /* check that a write has not made the stripe insync */ + if (test_bit(STRIPE_INSYNC, &sh->state)) + break; + /* now write out any block on a failed drive, - * or P or Q if they need it + * or P or Q if they were recomputed */ - + BUG_ON(s->uptodate < disks - 1); /* We don't need Q to recover */ if (s->failed == 2) { dev = &sh->dev[r6s->failed_num[1]]; s->locked++; @@ -2633,14 +2736,13 @@ static void handle_parity_checks6(raid5_conf_t *conf, struct stripe_head *sh, set_bit(R5_LOCKED, &dev->flags); set_bit(R5_Wantwrite, &dev->flags); } - - if (update_p) { + if (sh->ops.zero_sum_result & SUM_CHECK_P_RESULT) { dev = &sh->dev[pd_idx]; s->locked++; set_bit(R5_LOCKED, &dev->flags); set_bit(R5_Wantwrite, &dev->flags); } - if (update_q) { + if (sh->ops.zero_sum_result & SUM_CHECK_Q_RESULT) { dev = &sh->dev[qd_idx]; s->locked++; set_bit(R5_LOCKED, &dev->flags); @@ -2649,6 +2751,70 @@ static void handle_parity_checks6(raid5_conf_t *conf, struct stripe_head *sh, clear_bit(STRIPE_DEGRADED, &sh->state); set_bit(STRIPE_INSYNC, &sh->state); + break; + case check_state_run: + case check_state_run_q: + case check_state_run_pq: + break; /* we will be called again upon completion */ + case check_state_check_result: + sh->check_state = check_state_idle; + + /* handle a successful check operation, if parity is correct + * we are done. Otherwise update the mismatch count and repair + * parity if !MD_RECOVERY_CHECK + */ + if (sh->ops.zero_sum_result == 0) { + /* both parities are correct */ + if (!s->failed) + set_bit(STRIPE_INSYNC, &sh->state); + else { + /* in contrast to the raid5 case we can validate + * parity, but still have a failure to write + * back + */ + sh->check_state = check_state_compute_result; + /* Returning at this point means that we may go + * off and bring p and/or q uptodate again so + * we make sure to check zero_sum_result again + * to verify if p or q need writeback + */ + } + } else { + conf->mddev->resync_mismatches += STRIPE_SECTORS; + if (test_bit(MD_RECOVERY_CHECK, &conf->mddev->recovery)) + /* don't try to repair!! */ + set_bit(STRIPE_INSYNC, &sh->state); + else { + int *target = &sh->ops.target; + + sh->ops.target = -1; + sh->ops.target2 = -1; + sh->check_state = check_state_compute_run; + set_bit(STRIPE_COMPUTE_RUN, &sh->state); + set_bit(STRIPE_OP_COMPUTE_BLK, &s->ops_request); + if (sh->ops.zero_sum_result & SUM_CHECK_P_RESULT) { + set_bit(R5_Wantcompute, + &sh->dev[pd_idx].flags); + *target = pd_idx; + target = &sh->ops.target2; + s->uptodate++; + } + if (sh->ops.zero_sum_result & SUM_CHECK_Q_RESULT) { + set_bit(R5_Wantcompute, + &sh->dev[qd_idx].flags); + *target = qd_idx; + s->uptodate++; + } + } + } + break; + case check_state_compute_run: + break; + default: + printk(KERN_ERR "%s: unknown check_state: %d sector: %llu\n", + __func__, sh->check_state, + (unsigned long long) sh->sector); + BUG(); } } @@ -2666,6 +2832,7 @@ static void handle_stripe_expansion(raid5_conf_t *conf, struct stripe_head *sh, if (i != sh->pd_idx && i != sh->qd_idx) { int dd_idx, j; struct stripe_head *sh2; + struct async_submit_ctl submit; sector_t bn = compute_blocknr(sh, i, 1); sector_t s = raid5_compute_sector(conf, bn, 0, @@ -2685,9 +2852,10 @@ static void handle_stripe_expansion(raid5_conf_t *conf, struct stripe_head *sh, } /* place all the copies on one channel */ + init_async_submit(&submit, 0, tx, NULL, NULL, NULL); tx = async_memcpy(sh2->dev[dd_idx].page, - sh->dev[i].page, 0, 0, STRIPE_SIZE, - ASYNC_TX_DEP_ACK, tx, NULL, NULL); + sh->dev[i].page, 0, 0, STRIPE_SIZE, + &submit); set_bit(R5_Expanded, &sh2->dev[dd_idx].flags); set_bit(R5_UPTODATE, &sh2->dev[dd_idx].flags); @@ -2756,7 +2924,8 @@ static bool handle_stripe5(struct stripe_head *sh) rcu_read_lock(); for (i=disks; i--; ) { mdk_rdev_t *rdev; - struct r5dev *dev = &sh->dev[i]; + + dev = &sh->dev[i]; clear_bit(R5_Insync, &dev->flags); pr_debug("check %d: state 0x%lx toread %p read %p write %p " @@ -2973,7 +3142,7 @@ static bool handle_stripe5(struct stripe_head *sh) /* Need to write out all blocks after computing parity */ sh->disks = conf->raid_disks; stripe_set_idx(sh->sector, conf, 0, sh); - schedule_reconstruction5(sh, &s, 1, 1); + schedule_reconstruction(sh, &s, 1, 1); } else if (s.expanded && !sh->reconstruct_state && s.locked == 0) { clear_bit(STRIPE_EXPAND_READY, &sh->state); atomic_dec(&conf->reshape_stripes); @@ -2993,7 +3162,7 @@ static bool handle_stripe5(struct stripe_head *sh) md_wait_for_blocked_rdev(blocked_rdev, conf->mddev); if (s.ops_request) - raid5_run_ops(sh, s.ops_request); + raid_run_ops(sh, s.ops_request); ops_run_io(sh, &s); @@ -3002,7 +3171,7 @@ static bool handle_stripe5(struct stripe_head *sh) return blocked_rdev == NULL; } -static bool handle_stripe6(struct stripe_head *sh, struct page *tmp_page) +static bool handle_stripe6(struct stripe_head *sh) { raid5_conf_t *conf = sh->raid_conf; int disks = sh->disks; @@ -3014,9 +3183,10 @@ static bool handle_stripe6(struct stripe_head *sh, struct page *tmp_page) mdk_rdev_t *blocked_rdev = NULL; pr_debug("handling stripe %llu, state=%#lx cnt=%d, " - "pd_idx=%d, qd_idx=%d\n", + "pd_idx=%d, qd_idx=%d\n, check:%d, reconstruct:%d\n", (unsigned long long)sh->sector, sh->state, - atomic_read(&sh->count), pd_idx, qd_idx); + atomic_read(&sh->count), pd_idx, qd_idx, + sh->check_state, sh->reconstruct_state); memset(&s, 0, sizeof(s)); spin_lock(&sh->lock); @@ -3036,35 +3206,26 @@ static bool handle_stripe6(struct stripe_head *sh, struct page *tmp_page) pr_debug("check %d: state 0x%lx read %p write %p written %p\n", i, dev->flags, dev->toread, dev->towrite, dev->written); - /* maybe we can reply to a read */ - if (test_bit(R5_UPTODATE, &dev->flags) && dev->toread) { - struct bio *rbi, *rbi2; - pr_debug("Return read for disc %d\n", i); - spin_lock_irq(&conf->device_lock); - rbi = dev->toread; - dev->toread = NULL; - if (test_and_clear_bit(R5_Overlap, &dev->flags)) - wake_up(&conf->wait_for_overlap); - spin_unlock_irq(&conf->device_lock); - while (rbi && rbi->bi_sector < dev->sector + STRIPE_SECTORS) { - copy_data(0, rbi, dev->page, dev->sector); - rbi2 = r5_next_bio(rbi, dev->sector); - spin_lock_irq(&conf->device_lock); - if (!raid5_dec_bi_phys_segments(rbi)) { - rbi->bi_next = return_bi; - return_bi = rbi; - } - spin_unlock_irq(&conf->device_lock); - rbi = rbi2; - } - } + /* maybe we can reply to a read + * + * new wantfill requests are only permitted while + * ops_complete_biofill is guaranteed to be inactive + */ + if (test_bit(R5_UPTODATE, &dev->flags) && dev->toread && + !test_bit(STRIPE_BIOFILL_RUN, &sh->state)) + set_bit(R5_Wantfill, &dev->flags); /* now count some things */ if (test_bit(R5_LOCKED, &dev->flags)) s.locked++; if (test_bit(R5_UPTODATE, &dev->flags)) s.uptodate++; + if (test_bit(R5_Wantcompute, &dev->flags)) { + s.compute++; + BUG_ON(s.compute > 2); + } - - if (dev->toread) + if (test_bit(R5_Wantfill, &dev->flags)) { + s.to_fill++; + } else if (dev->toread) s.to_read++; if (dev->towrite) { s.to_write++; @@ -3105,6 +3266,11 @@ static bool handle_stripe6(struct stripe_head *sh, struct page *tmp_page) blocked_rdev = NULL; } + if (s.to_fill && !test_bit(STRIPE_BIOFILL_RUN, &sh->state)) { + set_bit(STRIPE_OP_BIOFILL, &s.ops_request); + set_bit(STRIPE_BIOFILL_RUN, &sh->state); + } + pr_debug("locked=%d uptodate=%d to_read=%d" " to_write=%d failed=%d failed_num=%d,%d\n", s.locked, s.uptodate, s.to_read, s.to_write, s.failed, @@ -3145,19 +3311,62 @@ static bool handle_stripe6(struct stripe_head *sh, struct page *tmp_page) * or to load a block that is being partially written. */ if (s.to_read || s.non_overwrite || (s.to_write && s.failed) || - (s.syncing && (s.uptodate < disks)) || s.expanding) + (s.syncing && (s.uptodate + s.compute < disks)) || s.expanding) handle_stripe_fill6(sh, &s, &r6s, disks); - /* now to consider writing and what else, if anything should be read */ - if (s.to_write) + /* Now we check to see if any write operations have recently + * completed + */ + if (sh->reconstruct_state == reconstruct_state_drain_result) { + int qd_idx = sh->qd_idx; + + sh->reconstruct_state = reconstruct_state_idle; + /* All the 'written' buffers and the parity blocks are ready to + * be written back to disk + */ + BUG_ON(!test_bit(R5_UPTODATE, &sh->dev[sh->pd_idx].flags)); + BUG_ON(!test_bit(R5_UPTODATE, &sh->dev[qd_idx].flags)); + for (i = disks; i--; ) { + dev = &sh->dev[i]; + if (test_bit(R5_LOCKED, &dev->flags) && + (i == sh->pd_idx || i == qd_idx || + dev->written)) { + pr_debug("Writing block %d\n", i); + BUG_ON(!test_bit(R5_UPTODATE, &dev->flags)); + set_bit(R5_Wantwrite, &dev->flags); + if (!test_bit(R5_Insync, &dev->flags) || + ((i == sh->pd_idx || i == qd_idx) && + s.failed == 0)) + set_bit(STRIPE_INSYNC, &sh->state); + } + } + if (test_and_clear_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) { + atomic_dec(&conf->preread_active_stripes); + if (atomic_read(&conf->preread_active_stripes) < + IO_THRESHOLD) + md_wakeup_thread(conf->mddev->thread); + } + } + + /* Now to consider new write requests and what else, if anything + * should be read. We do not handle new writes when: + * 1/ A 'write' operation (copy+gen_syndrome) is already in flight. + * 2/ A 'check' operation is in flight, as it may clobber the parity + * block. + */ + if (s.to_write && !sh->reconstruct_state && !sh->check_state) handle_stripe_dirtying6(conf, sh, &s, &r6s, disks); /* maybe we need to check and possibly fix the parity for this stripe * Any reads will already have been scheduled, so we just see if enough - * data is available + * data is available. The parity check is held off while parity + * dependent operations are in flight. */ - if (s.syncing && s.locked == 0 && !test_bit(STRIPE_INSYNC, &sh->state)) - handle_parity_checks6(conf, sh, &s, &r6s, tmp_page, disks); + if (sh->check_state || + (s.syncing && s.locked == 0 && + !test_bit(STRIPE_COMPUTE_RUN, &sh->state) && + !test_bit(STRIPE_INSYNC, &sh->state))) + handle_parity_checks6(conf, sh, &s, &r6s, disks); if (s.syncing && s.locked == 0 && test_bit(STRIPE_INSYNC, &sh->state)) { md_done_sync(conf->mddev, STRIPE_SECTORS,1); @@ -3178,15 +3387,29 @@ static bool handle_stripe6(struct stripe_head *sh, struct page *tmp_page) set_bit(R5_Wantwrite, &dev->flags); set_bit(R5_ReWrite, &dev->flags); set_bit(R5_LOCKED, &dev->flags); + s.locked++; } else { /* let's read it back */ set_bit(R5_Wantread, &dev->flags); set_bit(R5_LOCKED, &dev->flags); + s.locked++; } } } - if (s.expanded && test_bit(STRIPE_EXPANDING, &sh->state)) { + /* Finish reconstruct operations initiated by the expansion process */ + if (sh->reconstruct_state == reconstruct_state_result) { + sh->reconstruct_state = reconstruct_state_idle; + clear_bit(STRIPE_EXPANDING, &sh->state); + for (i = conf->raid_disks; i--; ) { + set_bit(R5_Wantwrite, &sh->dev[i].flags); + set_bit(R5_LOCKED, &sh->dev[i].flags); + s.locked++; + } + } + + if (s.expanded && test_bit(STRIPE_EXPANDING, &sh->state) && + !sh->reconstruct_state) { struct stripe_head *sh2 = get_active_stripe(conf, sh->sector, 1, 1, 1); if (sh2 && test_bit(STRIPE_EXPAND_SOURCE, &sh2->state)) { @@ -3207,14 +3430,8 @@ static bool handle_stripe6(struct stripe_head *sh, struct page *tmp_page) /* Need to write out all blocks after computing P&Q */ sh->disks = conf->raid_disks; stripe_set_idx(sh->sector, conf, 0, sh); - compute_parity6(sh, RECONSTRUCT_WRITE); - for (i = conf->raid_disks ; i-- ; ) { - set_bit(R5_LOCKED, &sh->dev[i].flags); - s.locked++; - set_bit(R5_Wantwrite, &sh->dev[i].flags); - } - clear_bit(STRIPE_EXPANDING, &sh->state); - } else if (s.expanded) { + schedule_reconstruction(sh, &s, 1, 1); + } else if (s.expanded && !sh->reconstruct_state && s.locked == 0) { clear_bit(STRIPE_EXPAND_READY, &sh->state); atomic_dec(&conf->reshape_stripes); wake_up(&conf->wait_for_overlap); @@ -3232,6 +3449,9 @@ static bool handle_stripe6(struct stripe_head *sh, struct page *tmp_page) if (unlikely(blocked_rdev)) md_wait_for_blocked_rdev(blocked_rdev, conf->mddev); + if (s.ops_request) + raid_run_ops(sh, s.ops_request); + ops_run_io(sh, &s); return_io(return_bi); @@ -3240,16 +3460,14 @@ static bool handle_stripe6(struct stripe_head *sh, struct page *tmp_page) } /* returns true if the stripe was handled */ -static bool handle_stripe(struct stripe_head *sh, struct page *tmp_page) +static bool handle_stripe(struct stripe_head *sh) { if (sh->raid_conf->level == 6) - return handle_stripe6(sh, tmp_page); + return handle_stripe6(sh); else return handle_stripe5(sh); } - - static void raid5_activate_delayed(raid5_conf_t *conf) { if (atomic_read(&conf->preread_active_stripes) < IO_THRESHOLD) { @@ -3331,6 +3549,9 @@ static int raid5_congested(void *data, int bits) /* No difference between reads and writes. Just check * how busy the stripe_cache is */ + + if (mddev_congested(mddev, bits)) + return 1; if (conf->inactive_blocked) return 1; if (conf->quiesce) @@ -3880,7 +4101,7 @@ static sector_t reshape_request(mddev_t *mddev, sector_t sector_nr, int *skipped INIT_LIST_HEAD(&stripes); for (i = 0; i < reshape_sectors; i += STRIPE_SECTORS) { int j; - int skipped = 0; + int skipped_disk = 0; sh = get_active_stripe(conf, stripe_addr+i, 0, 0, 1); set_bit(STRIPE_EXPANDING, &sh->state); atomic_inc(&conf->reshape_stripes); @@ -3896,14 +4117,14 @@ static sector_t reshape_request(mddev_t *mddev, sector_t sector_nr, int *skipped continue; s = compute_blocknr(sh, j, 0); if (s < raid5_size(mddev, 0, 0)) { - skipped = 1; + skipped_disk = 1; continue; } memset(page_address(sh->dev[j].page), 0, STRIPE_SIZE); set_bit(R5_Expanded, &sh->dev[j].flags); set_bit(R5_UPTODATE, &sh->dev[j].flags); } - if (!skipped) { + if (!skipped_disk) { set_bit(STRIPE_EXPAND_READY, &sh->state); set_bit(STRIPE_HANDLE, &sh->state); } @@ -4057,7 +4278,7 @@ static inline sector_t sync_request(mddev_t *mddev, sector_t sector_nr, int *ski spin_unlock(&sh->lock); /* wait for any blocked device to be handled */ - while(unlikely(!handle_stripe(sh, NULL))) + while (unlikely(!handle_stripe(sh))) ; release_stripe(sh); @@ -4114,7 +4335,7 @@ static int retry_aligned_read(raid5_conf_t *conf, struct bio *raid_bio) return handled; } - handle_stripe(sh, NULL); + handle_stripe(sh); release_stripe(sh); handled++; } @@ -4128,6 +4349,36 @@ static int retry_aligned_read(raid5_conf_t *conf, struct bio *raid_bio) return handled; } +#ifdef CONFIG_MULTICORE_RAID456 +static void __process_stripe(void *param, async_cookie_t cookie) +{ + struct stripe_head *sh = param; + + handle_stripe(sh); + release_stripe(sh); +} + +static void process_stripe(struct stripe_head *sh, struct list_head *domain) +{ + async_schedule_domain(__process_stripe, sh, domain); +} + +static void synchronize_stripe_processing(struct list_head *domain) +{ + async_synchronize_full_domain(domain); +} +#else +static void process_stripe(struct stripe_head *sh, struct list_head *domain) +{ + handle_stripe(sh); + release_stripe(sh); + cond_resched(); +} + +static void synchronize_stripe_processing(struct list_head *domain) +{ +} +#endif /* @@ -4142,6 +4393,7 @@ static void raid5d(mddev_t *mddev) struct stripe_head *sh; raid5_conf_t *conf = mddev->private; int handled; + LIST_HEAD(raid_domain); pr_debug("+++ raid5d active\n"); @@ -4178,8 +4430,7 @@ static void raid5d(mddev_t *mddev) spin_unlock_irq(&conf->device_lock); handled++; - handle_stripe(sh, conf->spare_page); - release_stripe(sh); + process_stripe(sh, &raid_domain); spin_lock_irq(&conf->device_lock); } @@ -4187,6 +4438,7 @@ static void raid5d(mddev_t *mddev) spin_unlock_irq(&conf->device_lock); + synchronize_stripe_processing(&raid_domain); async_tx_issue_pending_all(); unplug_slaves(mddev); @@ -4319,15 +4571,118 @@ raid5_size(mddev_t *mddev, sector_t sectors, int raid_disks) return sectors * (raid_disks - conf->max_degraded); } +static void raid5_free_percpu(raid5_conf_t *conf) +{ + struct raid5_percpu *percpu; + unsigned long cpu; + + if (!conf->percpu) + return; + + get_online_cpus(); + for_each_possible_cpu(cpu) { + percpu = per_cpu_ptr(conf->percpu, cpu); + safe_put_page(percpu->spare_page); + kfree(percpu->scribble); + } +#ifdef CONFIG_HOTPLUG_CPU + unregister_cpu_notifier(&conf->cpu_notify); +#endif + put_online_cpus(); + + free_percpu(conf->percpu); +} + static void free_conf(raid5_conf_t *conf) { shrink_stripes(conf); - safe_put_page(conf->spare_page); + raid5_free_percpu(conf); kfree(conf->disks); kfree(conf->stripe_hashtbl); kfree(conf); } +#ifdef CONFIG_HOTPLUG_CPU +static int raid456_cpu_notify(struct notifier_block *nfb, unsigned long action, + void *hcpu) +{ + raid5_conf_t *conf = container_of(nfb, raid5_conf_t, cpu_notify); + long cpu = (long)hcpu; + struct raid5_percpu *percpu = per_cpu_ptr(conf->percpu, cpu); + + switch (action) { + case CPU_UP_PREPARE: + case CPU_UP_PREPARE_FROZEN: + if (conf->level == 6 && !percpu->spare_page) + percpu->spare_page = alloc_page(GFP_KERNEL); + if (!percpu->scribble) + percpu->scribble = kmalloc(conf->scribble_len, GFP_KERNEL); + + if (!percpu->scribble || + (conf->level == 6 && !percpu->spare_page)) { + safe_put_page(percpu->spare_page); + kfree(percpu->scribble); + pr_err("%s: failed memory allocation for cpu%ld\n", + __func__, cpu); + return NOTIFY_BAD; + } + break; + case CPU_DEAD: + case CPU_DEAD_FROZEN: + safe_put_page(percpu->spare_page); + kfree(percpu->scribble); + percpu->spare_page = NULL; + percpu->scribble = NULL; + break; + default: + break; + } + return NOTIFY_OK; +} +#endif + +static int raid5_alloc_percpu(raid5_conf_t *conf) +{ + unsigned long cpu; + struct page *spare_page; + struct raid5_percpu *allcpus; + void *scribble; + int err; + + allcpus = alloc_percpu(struct raid5_percpu); + if (!allcpus) + return -ENOMEM; + conf->percpu = allcpus; + + get_online_cpus(); + err = 0; + for_each_present_cpu(cpu) { + if (conf->level == 6) { + spare_page = alloc_page(GFP_KERNEL); + if (!spare_page) { + err = -ENOMEM; + break; + } + per_cpu_ptr(conf->percpu, cpu)->spare_page = spare_page; + } + scribble = kmalloc(scribble_len(conf->raid_disks), GFP_KERNEL); + if (!scribble) { + err = -ENOMEM; + break; + } + per_cpu_ptr(conf->percpu, cpu)->scribble = scribble; + } +#ifdef CONFIG_HOTPLUG_CPU + conf->cpu_notify.notifier_call = raid456_cpu_notify; + conf->cpu_notify.priority = 0; + if (err == 0) + err = register_cpu_notifier(&conf->cpu_notify); +#endif + put_online_cpus(); + + return err; +} + static raid5_conf_t *setup_conf(mddev_t *mddev) { raid5_conf_t *conf; @@ -4369,6 +4724,7 @@ static raid5_conf_t *setup_conf(mddev_t *mddev) goto abort; conf->raid_disks = mddev->raid_disks; + conf->scribble_len = scribble_len(conf->raid_disks); if (mddev->reshape_position == MaxSector) conf->previous_raid_disks = mddev->raid_disks; else @@ -4384,11 +4740,10 @@ static raid5_conf_t *setup_conf(mddev_t *mddev) if ((conf->stripe_hashtbl = kzalloc(PAGE_SIZE, GFP_KERNEL)) == NULL) goto abort; - if (mddev->new_level == 6) { - conf->spare_page = alloc_page(GFP_KERNEL); - if (!conf->spare_page) - goto abort; - } + conf->level = mddev->new_level; + if (raid5_alloc_percpu(conf) != 0) + goto abort; + spin_lock_init(&conf->device_lock); init_waitqueue_head(&conf->wait_for_stripe); init_waitqueue_head(&conf->wait_for_overlap); @@ -4447,7 +4802,7 @@ static raid5_conf_t *setup_conf(mddev_t *mddev) printk(KERN_INFO "raid5: allocated %dkB for %s\n", memory, mdname(mddev)); - conf->thread = md_register_thread(raid5d, mddev, "%s_raid5"); + conf->thread = md_register_thread(raid5d, mddev, NULL); if (!conf->thread) { printk(KERN_ERR "raid5: couldn't allocate thread for %s\n", @@ -4613,7 +4968,7 @@ static int run(mddev_t *mddev) set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); mddev->sync_thread = md_register_thread(md_do_sync, mddev, - "%s_reshape"); + "reshape"); } /* read-ahead size must cover two whole stripes, which is @@ -5031,7 +5386,7 @@ static int raid5_start_reshape(mddev_t *mddev) set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); mddev->sync_thread = md_register_thread(md_do_sync, mddev, - "%s_reshape"); + "reshape"); if (!mddev->sync_thread) { mddev->recovery = 0; spin_lock_irq(&conf->device_lock); |